Impression throw off and on device for traveling-cylinder presses



I June 5, 1923 I. F1 (ICDX IMPRESSION THROW OFF AND ON DEVICE FORTRAVELING CYLINDER PRESSES 2 Shsets-Sheet l Filed Aug. 27,

June 5, 1923. 1,457,501

P. F. COX

IMPRESSION THROW OFF AND ON DEVICE FOR TRAVELING, CYLINDER PRESSES FiledAug. 2'? 1921 2 Sheets-Sheet 2 JHIHIHIIIIIIHIHIIIHIIIIHIHIIIIIIHIHHHIIIIIIH Patented June 5, 1923.

UNETEQ STATES raiser rarsur QFFHQE.

PAUL 1?. COX, OF CHICAGO, ILLINOIS.

IMPRESSION THRQW OFF AND ON DEVICE FOR TRAVELING CYLINDER PRESSES.

Application filed August 27, 1921. Serial No. 495,872.

1 '0 all whom it may concern:

Be it known that 1, PAUL F. Cox, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Impression Throw Off andOn Devices for Traveling-Cylinder Presses; and I hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, which form part of thisspecification.

This invention relates to improvements in fiat-bed web perfectingprinting presses in which the web is printed by means of travel ing(oscillating) impression cylinders from flat forms of type, or plates,resting upon stationary beds; while the cylinders are moving in onedirection; said cylinders returning over the beds out of contact withthe printing forms, to give time for the intermittent spacing andfeeding of the web of paper.

In such presses the impression cylinders are raised and held offimpression upon one stroke, so as not to contact the printing forms; andare then lowered down to bearers, or printing line, and held firmly onimpressionFduring the return stroke of such cylinders. The principalobject of this invention is to provide a simple novel mechanism forthrowing the impression cylinders off and on impression on theiralternate strokes.

In the embodiment of the invention shown in the drawings the cams forthrowing the cylinders on and off impression, and the means for lockingthem on and off impression, are placed in the guideways in the mainframes of the press, in which the guideways and cylinder carrying crossheads travel, the cams and locking devices being thus located in a mostconvenient position for coacting with the devices on the cross heads bywhich the cylinders are raised and lowered, and which must necessarilytravel with the cross heads and impression cylinders.

While the invention is primarily designed for use in a web perfectingpress, it is applicable to single acting presses; and to sheet presses;and to other types of machines in which traveling cylinders are employedwhich are to be thrown off impression on one stroke and-thrown onimpression on the return stroke.

I will explain the invention with reference to the accompanying drawingswhich illustrate so much of a well known type of web perfecting press aswill enable the invention to be clearly understood. In the claims I havesummarized the essentials of the invention, and the novel features ofconstruction, and novel combinations of parts, for which protection isdesired.

In the drawings:

Fig. 1 is a partial side elevation of a web printing press showing mynovel mechanism for throwing the cylinders on or off impression and forholding the same on or off impression while the cylinders are passingover the forms.

Fig. 2 is an enlarged end elevation showing the latch bolt operatingdevice shown in Fig. 1.

Fig. 3 is a sectional View on the line 33, Fig. 5, looking in thedirection of the arrows on said line.

Fig. i is a similar sectional View on the line 4-4, Fig. 5, looking inthe direction of the arrows on said line.

Fig. 5 is an enlarged side elevation showv ing the arrangement of thecamways in the cross head guideway.

In the drawings 1- and 1 designate parallel type beds arranged one overthe other in a suitable main frame. Cooperating with bed 1 is atraveling impression cylinder 2, and cooperating with bed 1 is atraveling impression cylinder 2*. These cylinders are mounted inbearings in crossheads 3 which are guided in longitudinal guideways 4 inthe sides of the press frame.

The cross heads 3 are reciprocated longitudinally of the guideways i soas to move the cylinders 52 and 2 back and forth over the beds by anysuitable means, preferably by means of pitmen 3 connecting thecrossheads 3 with crank gears 3 which may be operated by any suitablemechanism.

The general construction and arrangement of such machine and of theaforesaid parts are well known and need no further detailed explanationherein.

The webw is led over suitable guiding rolL ers through the press andsuccessively betweenthe cylinder 2 and bed 1-,-and then between thecylinder 2 and the bed 1, to the delivery and suitable means areprovided for intermittently drawing the web forward between successiveimpressions, and while the cylinders are thrown off impression buttraveling over the beds. The means for feeding, guiding, leading andshifting the webs, may be of any desired construction, form no part ofthe present invention, and are well understood, and need no furtherdetailed explanation herein.

In the press shown the cylinders are on impression curing one stroke,and off im pression during the other stroke of the crossheads.

The cylinder is shown as j ournale-d in eccentric bearings 5 on thecrosshead, and the cylinder 2 in eccentric bearings 5 on the crosshead.Such bearings are wel knownas shown the bearings are provided withprojecting arms 5 and 5 which are connected by a vertically disposed bar5 which carries a cam pin 5 which projects into the adjacent guideway 4.

The connecting bar 5 is arranged vertically beside the frame at theinner end of the crosshead and between the pitnian 3 and the frame ofthe press.

Arranged within the guideway adjacent the opposite limits of the lineartravel of the pin 5 are cams 6 and 6 Cam 6 is adapted to be engaged bythe pin 5 (which may be provided with an antifriction roller) as thecrosshead reaches the limit of its outward stroke and depress the bar 5thereby rocking the eccentrics 5, 5 so as to slightly lower thecylinders 2, 2, thereby throwing them on impression so that the surfaceof the cylinders will impress the web of paper upon the type forms uponthe beds 1, 1 during the following inward stroke of the crossheads.

Cam 6* is arranged in the guideway l near the inner end thereof in suchposition that it will be engaged by the pin 5 as the crossheads near theinner limit of their stroke, and after the cylinders have cleared theforms, so as to raise bar 5 thereby rocking the eccentrics 5, andraising the cylinders 2, 2 slightly (throwing them off impression) sothat on the following outward stroke of the cylinder they vill clear theforms and not impress the web of paper thereon. lVhile the cylinders arethus oft impression and while they are moving outward the web to isshifted lengthwise between the beds and cylinders sudiciently to movethe printed impressions clear of the forms, and bring the nextsucceeding un-printed portions of the paper in position to be printed onthe next inward stroke of the cylinders and after the same have beenthrown on impression by the action of the cam 6 and lever 5* as abovedescribed.

Arranged longitudinally of the guideway 4 and between the cams 6 is bar6 under which the pin 5 travels during the inward stroke of thecylinders and over which the pin 5 travels during the outward stroke ofthe cylinders and this bar serves to lock the pin 5 and bar 5 againstvertical movement and prevents any accidental shifting of the cylinderbearings during the time that the cylinders are moving over the typeforms on the beds. Thus the bar 6 and pin 5 serve to lock the cylinderson impression during the printing stroke and to lock them off impressionduring the return stroke of the cylinders.

The cams 6, G and locking bar 6 are so placed in the bottom of theguideway 4 that they do not interfere with the operation of thecrossheads or the movement of the crossheads in the guideways 4c; thepin 5 projects suthciently inward to engage the cams 6, 6" and the upperand lower sides of the lock bar 6. The inner end of the pin 5* traversesthe camway 6 which is formed in the inner side or bottom of the guideway4} as indicated in the drawing. The cams thus located will not interferewith other parts and oil supplied to the crossheads serves to lubricatethe ways and parts of the throwofi' mechanism which are located in thesame guideways.

If desired devices may be provided for preventing displacement of thebar 5 and cylinders while the pin 5 is moving across the space betweenthe inner end of the lock bar 6 and the upper end of the cam 6*. Asshown a bolt 7 is confined in a keeper 7 on the crosshead and isnormally pressed upward to engage with a. notch 5 in the lower side ofthe eccentric 5, by a. suitable spring. A flat spring 7" is shown butany other suitable spring may be used. The bolt 7 carries a pin orroller 7 on its lower end which is adapted to engage a cam 7 which isattached to the side frame of the press, adjacent the outer limit oftravel of the crosshead in position to cause pin 7 to withdraw the bolt'7 from the notch 5 as the cylinders near the outer limit of theirmovement, and just before the pin 5 engages the cam 6 This latch bolt 7insures that the bar 5 will be held in raised position and keep thecylinders off impression while the pin 5 is passing the gap between theinner end ot the lock bar 6 and the upper end of cam 6.

The latch bolt 7 as stated is disengaged from the eccentric 5 justbefore the pin 5 engages the cam 6; and when the cylinders reach theouter end of their stroke the pin 5 and cam 6 shift the cylinders andeccentrics so that the notch 5 is out of position to engage the latchpin 7, but it is pressed upward by the spring 7 and will engage thenotch 5 as soon as it is again brought into position opposite the boltby the action of the pin 5' riding up on the cam 6 The bar 5 and pin 5are depressed by the action of the cam 6, and will normally remaindepressed while the pin is traversing the gap between the lower end ofthe cam 6 and the outer end of the lock bar 6 during the inward strokeof the cylinders.

The locking bar 6 and pin 5 absolutely prevent the cylinders beingshiftedon impression during the outward stroke of the cylinders; andalso insures holding the cylinders on impression during the inwardstroke of the cylinders.

From the foregoing it will be seen that the invention provides a noveland cheaply constructed mechanism for throwing the impression cylinderson or off impression at the proper times; and provides most reliable andeffective means for holding the cylinders on or of]? impression duringthe time that the cylinders are traveling over the forms.

What I claim is:

1. In a printing press, a bed, a cylinder, reciprocating crossheadscarrying the cylinder, guideways for said cross heads in the main frameof the press, means for raising and lowering the cylinder carried by thecrossheads, and cams in the guideway for alternately actuating the saidmeans, substantially as described.

2. In combination with mechanism as set forth in claim 1, means adaptedto lock the cylinder 01f impression during the non printing stroke ofthe cylinder over the bed.

3. In mechanism as set forth in claim 1, a bar adapted to coact withsaid means to hold the cylinder on or off impression during the time thecylinder is moving over the bed.

4. In a printing press, a type bed, a cylinder, reciprocating crossheadscarrying said cylinder, guideways in the frame for said crossheads,means carried by the crossheads for raising and lowering the cylinder, amember connected with said means and projecting into the guideway, andcams in the guideway adapted to be engaged by said member near the endsof the strokes of the crossheads to cause said means to throw thecylinders on or off impression.

5. In combination with mechanism as set forth in claim 4, a meansadapted to lock the cylinder 01f impression during its nonprintingstroke over the bed.

6. In mechanism as set forth in claim 4:, a bar adapted to coact withsaid member to hold the cylinder on or off impression during the time itis moving over the bed.

7. In a printing press, a bed, a reciprocating cylinder, crossheadscarrying the cylinder, guideways in the main frame of the press for saidcross heads, means for raising and lowering the cylinder carried by thecrossheads, a pin connected with said means and projecting into aguideway, and cams in the guideway adapted to be engaged by said pin tocause it to actuate the said means near the ends of the strokes of thecross-, heads.

8. In mechanism as set forth in claim 7 a bar arranged in said guidewaybetween the cam adapted to coact with said pin to hold the cylinder onor off impression during the time it is moving over the bed.

9. In a printing press, a bed, a cylinder, crossheads,a cylinder carriedby the cross heads, means for alternately throwingthe cylinder on or oilimpression, and a relatively fixed member extending longitudinally ofthe path of the crossheads, and adapted to 00-- act with said means tohold the cylinder on or off impression during the time the cylinder ismoving over the bed. 7

10. In a printing press, a bed, a cylinder, reciprocating crossheads,means for alternately raising and lowering the cylinder" carried by thecrossheads and a relatively fixed bar extending longitudinally of thepath of the crossheads and adapted to coact with said means-to hold thecylinder on or off impression during the time the cylinder is movingover the bed.

11. In a printing press, a type bed, a cylinder, reciprocatingcrossheads carrying said cylinder, devices carried by the cross headsfor raising and lowering the cylinder, a member connected with saiddevices, and cam means adapted to cause said devices to throw thecylinders on or off impression, with a relatively fixed bar extendinglongitudinally of the path of the crossheads and between the cams, andadapted to coact with said devices to hold the cylinder on or offimpression during the time it is moving over the bed. 7

12. In a printing press, a type bed, a cylinder, reciprocatingcrossheads carrying said cylinder, means carried by the cross heads forraising and lowering the cylinder. a member connected with said means,and cams adapted to be engaged by said member near the ends of thestrokes of the crossheads to cause said means to throw the cylinders onor ofi'impression; with a relatively fixed bar extending longitudinallyof the path of the crossheads and between the cams and adapted to coactwith said member to hold the cylinders on or of! impression during thetime it is moving over the bed.

13. In a printing press, a main frame, type beds, reciprocatingcrossheads for carrying said cylinders, means on the crossheads forraising and lowering the cylinders. connections between said means, amember attached to said connections, cams adapted to be engaged by saidmember near the ends of the strokes of the crossheads to cause saidmeans to throw the cylinders on or oil impression, and a relativelyfixed bar extending longitudinally of the path of the crossheads andbetween the cams and adapted to coact with said member to hold thecylinders on or 01f impression during the time the cylinders are movingover the beds.

14:. In a printing press, a main frame having guideways, type beds,reciprocating crossheads for carrying said cylinders guided by saidguideways, means on the crossheads for raising and lowering thecylinders, connections between said means, a member attached to saidconnections and projecting into a guideway, cams in said guideway,adapted to be engaged by said member near the ends of the strokes of thecross heads to cause said means to throw the cylinders on or offimpression, and a bar arranged in the guideway between the cams adaptedto coaet "ith said member to hold the cylinders on or ofi' impressioncuring the time the cylinders are moving over the beds.

15. In a printing press, a main frame, type beds, reciprocating crossheads for carrying said cylinders, gnideways for said crossheads in theframe, means on the cross heads for raising and lowering the cylinders,connections between the means, a member attached to said connections andprojecting into the guideway, and cams in the guideway adapted to beengaged by said member near the ends of the strokes of the crossheadsand cause said means to throw the cylinders on or off impression.

16. In mechanism as set forth in claim 15, means adapted to lock thecylinders 0ft impression during one stroke of the cylinders.

17. In mechanism as set forth in claim 15, a bar arranged adapted tocoact with sai member to hold the cylinders on or off impression duringthe time the cylinders are moving over the beds.

18. On a printing press, a main frame provided with guideways, typebeds, cylinders, reciprocating crossheads mounted on the gnideways forcarrying said cylinders; eccentric devices on the crossheads for raisingand lowering the cylinders; a bar connecting said eccentric devices; apin connected with said bar and projecting into the guideway; and camsin the guideway adapted to be engaged by said pin near the ends of thestrokes of the crossheads to throw the cylinders on or off impression.

19. In mechanism set forth in claim 18, a bar arranged in said guidewaybetween the cams adapt d to coact with said pin to hold the cylinders onor oil impression during the time the cylinders are moving over thebeds.

20. a printing press, a main frame provided with gnideways, type beds,cylinders, reciprocating crossheads mounted on the gnid ways forcarrying said cylinders; eccentric devices on the crossheads for raisingand lowering the cylinders; a bar connecting said eccentric device; apin connected with said bar and projecting into the guidew and cams inthe guideway adapted to be engaged by said pin near the ends of thestrokes of the crossheads to throw the cylinders on or oit' impression;with a bolt adapted to engage an eccentric and lock it when thecylinders are thrown oti' impression near the. end of one stroke, andmeans todisengage the bolt near the end of the next succeeding stroke.

In niechanisnras set forth in claim 20, a bar arranged in said guidewaybetweeen the cams adapted to coact with said pin member to hold thecylinders on or ofl' impression during the time the cylinders are movingover the beds.

In testimony that I claim the foregoing as my own, I aflix my signature.

PAUL F. COX.

